GWD-9-Q13 质疑答案in 没有链接的题目

lexie

突然发现自己的逻辑是弱项　好像错的题很多都没有链接

我拿到的答案是E 大家看看　但是不觉得这个答案对

GWD-9-Q13:

Fact: Asthma, a bronchial condition, is much less common ailment than hay fever, an allergic inflammation of the nasal passages.

 

Fact: over 95 percent of people who have asthma also suffer from hay fever.

 

If the information given as facts above is true, which of the following must also be true?

 

1. Hay fever is a prerequisite for the development of asthma

2. Asthma is a prerequisite for the development of hay fever

3. Those who have neither hay fever nor asthma comprise less than 5 percent of the total population

4. The number of people who have both of these ailments is greater than the number of people who have only one of them

5. The percentage of people suffering from hay fever who also have asthma is lower than 95 percent.

Na表示得Asthma的人数　Nh表示得hay fever的人数　既然asthma is less common than hay fever...那么我们可以得出

Na<Nh...

把两种病都得的人设为Nah...Nah/Na>95% 如果Nah/Nh我们也不能推出这个一定<95% 所以我觉得E不正确

大家的看法如何？

挥着猪翅膀

实质考一点交集的集合知识。

我做这种题是用文氏图帮忙。题目大概意思我不懂。反正知道hay fever是asthma的一种并发症状。然后人家给出一个数量关系。

你的那个“Na<Nh...”比较是没有意义的，题目不是考察这种比较。

正确答案实际上是做了一个比较迷惑人的paraphrase。

我把原话fact:over 95 percent of people who have asthma also suffer from hay fever这么读：of people who have asthma , 95% also suffer from hat fever.这句话反应在图中就是得A病的人和得H病的人的交集是95%；

原文论述仅仅告诉上述几点。也即只说了hay fever是asthma的并发症，没有说asthma也是hay fever的并发症。所以A，B错在无关。因为这两个选项转移范围，题中没有给出谁是谁的先决条件，人家只给了H是A的并发症这个信息。

D项错误也是量的关系没有述及。所以无关的选项占了4个

C项错误有2个。第一，total population is not mentioned in the argument;第二，这个5%只在一个地方有意义，那就是得了asthma病的人有少于5%的人不会产生Hay fever这种并发症。

不知道分析得对不对，还请yaoyao，gonghao，leonchan等前辈指教。

yaoyao99

啊哈哈，别点名，吓得其他人都不敢回你贴了。

x% = people with asthma

y% = people with hay fever

Fact 1: x < y

Fact 2: x% * 95% = y% * z%

=> z < 95%

E

lexie

Yaoyao,

It makes perfect sense. I got to know where I was wrong. Really appreciate for your nice help.

lexie

同时也谢谢猪哥哥, 呵呵 你的头像很有趣.

ashleyyuan

這裡可不可以再講清楚一點,我看不太懂,
fact2只有說得氣喘的人有95%也有花粉熱
這裡 怎推得得花粉熱的人低於95%?
麻煩再解釋一番
謝謝

    

Fact: over 95 percent of people who
have asthma also suffer from hay fever.

    

fiona_hq

up